My 2018 CX5 FWD Grand Touring is making a screeching noise every time when it is turned off. It also makes the sound when the car is put in accessory mode and switched off. Engine does not have to be turned on. It's only a second or two long but it's very noticeable. We lifted up the car and we found out this was the part that was doing it. Looks to be on the exhaust. Anyone know what this is and if l can get the part separately? When we unplugged the cord, the noise went away but a vehicle system malfunction warning came up on the dash. Car has 100k miles on it as well.